score = 98
if score > 90:
    print('A')
elif score >80 and score <90:
    print('B')
elif score >70 and score <80:
    print('C')
elif score <70:
    print('D')

#bmi计算
#bmi =w/(h*h)
w = float(input('请输入你的体重，单位kg:'))
h = float(input('请输入你的身高,单位米：'))
bmi = w / (h*h)
print(bmi)
if bmi < 18.5:
    print("太瘦了，多吃一点吧")
elif bmi < 23.9:
    print('你非常健康')
else:
    print('多运动')